# Squarespace, GoDaddy, And The Markdown For Agents Warning — What You Can And Cannot Fix
Closed website builders like Squarespace and GoDaddy Website Builder cannot fully fix the Markdown for Agents warning because they don't expose HTTP-level controls. GoDaddy Managed WordPress and cPanel hosting can. Here is the honest split — what's possible on each, the partial workaround for closed platforms, and the real .htaccess + PHP fix for managed WordPress.
Author: J.A. Watte
Published: May 9, 2026
Source: https://jwatte.com/blog/blog-fix-markdown-for-agents-squarespace-godaddy/
---
If you ran a URL through the [Agent Runtime Readiness](/tools/agent-runtime-readiness/) audit and the third check came back amber, you saw:
> Host did not return Markdown content when Accept: text/markdown was requested. Enable Cloudflare Markdown for Agents or implement content negotiation at your origin.
If your site is on Squarespace, GoDaddy Website Builder, Wix, Shopify, or another closed managed builder, the answer is harder to give cleanly than on Netlify or Vercel. The honest split:
- **Closed builders (Squarespace, GoDaddy Website Builder, Wix, Shopify standard plans)** — you cannot fully fix this warning because you don't have access to HTTP-level controls. There is one partial workaround. There is also an upgrade path if this matters enough.
- **GoDaddy Managed WordPress, cPanel shared hosting, and similar PHP-with-`.htaccess` setups** — you *can* fully fix this. The implementation is a small `.htaccess` rule plus a PHP filter.
This post covers both honestly.
## Closed builders — the partial workaround and the limit
Squarespace, GoDaddy Website Builder, Wix, and Shopify (on standard plans) all hide the HTTP layer from you on purpose. You can edit page content, themes, fonts, and metadata. You cannot:
- Set custom response headers (`Content-Type`, `Vary`, `Content-Signal`)
- Intercept or rewrite responses based on request headers
- Serve different bodies to different `Accept` types
- Run server-side code or middleware in the request path
Without those, real HTTP content negotiation is impossible. The audit is checking whether your host responds with `text/markdown` body when asked nicely; closed builders cannot respond that way regardless of what you put in your settings.
### The one thing you can do — the passive declaration
Most closed builders allow some form of HTML head injection (Squarespace calls it Code Injection; Shopify uses theme.liquid; GoDaddy Website Builder has a more limited head-injection slot on premium plans only). You can use that to add this line to your ``:
```html
```
This tells AI runtimes that scan a page's `` for alternate format declarations that a markdown twin exists at a known URL. **It does not satisfy the Agent Runtime Readiness audit** — the audit verifies that the host actually responds with markdown when negotiated, not that it advertises a companion. The audit's third check will continue to warn.
It does, however, get you partial credit with retrievers that look for the `` declaration even when the negotiation fails. The Mega Analyzer audit on this site picks up the declaration as a separate signal, distinct from the negotiation check.
There's a deeper problem with this workaround on closed builders: even if you publish a `/your-page-slug.md` URL, the closed builder won't serve it as `text/markdown`. It'll either 404, or serve a generic HTML wrapper page with the slug in the URL bar. So the `` points at a URL that doesn't actually deliver markdown. Some retrievers will follow the link and fall back to scraping the HTML; some will record the failed fetch and not retry.
In other words: on closed builders, the warning stays. The partial workaround helps a little. The full fix requires moving off the closed builder.
### When this matters enough to consider migrating
It depends on your traffic shape. If your site gets meaningful AI-runtime traffic — chat citations, retriever fetches, search-grounding queries — and that traffic is growing, the cost of being illegible to runtimes is real. The cleanest migration paths from a closed builder, ranked roughly by effort:
1. **Squarespace → static-site generator on Netlify or Vercel** — biggest behavior change, fully fixable, lowest ongoing cost. See the [Netlify Edge Functions](/blog/blog-fix-markdown-for-agents-netlify/) or [Vercel Edge Middleware](/blog/blog-fix-markdown-for-agents-vercel/) post for the implementation.
2. **Squarespace → WordPress on managed hosting (including GoDaddy Managed WordPress)** — familiar editing experience, fully fixable, see the next section.
3. **Squarespace → Shopify Plus or Wix Velo** — same closed-builder problem at higher cost. Skip.
If your traffic is mostly human visitors and AI-runtime traffic is currently negligible, leave the warning as-is. It's a `warn`, not a `fail`. Your page is still readable by every runtime that exists. Revisit the migration question when AI traffic starts showing up in your access logs.
## GoDaddy Managed WordPress and cPanel — the real fix
If your site is on GoDaddy Managed WordPress, GoDaddy cPanel shared hosting, or any LAMP-stack environment with `.htaccess` and PHP access, you can implement the same content negotiation that Cloudflare's toggle provides. Two layers — an `.htaccess` rule for static `.md` files and a PHP filter for dynamic WordPress posts.
### Step 1 — `.htaccess` for static markdown files
If you have markdown files you can upload directly (e.g., a doc page you want available as both HTML and Markdown), put them in your site root and add this to `.htaccess`:
```apache
# Always advertise that responses vary by Accept
Header always set Vary "Accept"
# Serve .md as text/markdown
AddType "text/markdown; charset=utf-8" .md
RewriteEngine On
# Rewrite directory URLs to /index.md when client wants markdown
RewriteCond %{HTTP_ACCEPT} text/markdown [NC]
RewriteRule ^(.+)/$ /$1/index.md [L]
# Rewrite extensionless URLs to /file.md when client wants markdown
RewriteCond %{HTTP_ACCEPT} text/markdown [NC]
RewriteCond %{REQUEST_FILENAME} !\.md$
RewriteCond %{REQUEST_FILENAME}.md -f
RewriteRule ^(.+[^/])$ /$1.md [L]
```
GoDaddy Managed WordPress allows `.htaccess` edits via the File Manager in cPanel or via SFTP. After saving, request the URL with `curl -H "Accept: text/markdown"` and confirm the rewrite fires.
### Step 2 — PHP filter for WordPress posts
For WordPress posts (which are generated dynamically rather than from static `.md` files), add a must-use plugin that intercepts the response when the request Accept header includes `text/markdown` and outputs markdown.
Create `wp-content/mu-plugins/markdown-for-agents.php`:
```php
post_content);
// Convert rendered HTML to markdown
$converter = new \League\HTMLToMarkdown\HtmlConverter([
'header_style' => 'atx',
'strip_tags' => true,
]);
$body = $converter->convert($rendered);
$md = "# {$title}\n\n";
if ($excerpt) $md .= "_{$excerpt}_\n\n";
$md .= $body . "\n";
header('Content-Type: text/markdown; charset=utf-8');
header('Vary: Accept');
echo $md;
exit;
});
```
The `League\HTMLToMarkdown\HtmlConverter` class comes from the `league/html-to-markdown` Composer package. To install it on GoDaddy Managed WordPress, you have two options:
- **If you have SSH access (Pro/Ultimate plans):** `cd` into your site root, `composer require league/html-to-markdown`. The package autoloads via Composer's vendor directory.
- **If you only have FTP/cPanel access:** download the package's release tarball from GitHub, extract it into `wp-content/mu-plugins/vendor/league/html-to-markdown/`, and add `require_once __DIR__ . '/vendor/league/html-to-markdown/src/HtmlConverter.php';` (plus its dependencies) at the top of the mu-plugin file.
The cPanel-only path is awkward but works. SSH access makes it routine.
### Step 3 — Verify
```bash
curl -s -H "Accept: text/markdown" -i https://yoursite.com/some-post-slug/ | head -10
```
Look for `content-type: text/markdown; charset=utf-8` and `vary: Accept`. Re-run the [Agent Runtime Readiness audit](/tools/agent-runtime-readiness/) on the same URL — the third check should pass.
Common false negatives on GoDaddy Managed WordPress specifically:
- **Object cache served the HTML response.** GoDaddy Managed WordPress runs an object cache that may have stored the HTML response under the URL key without considering Accept. After enabling the mu-plugin, flush the cache from the GoDaddy dashboard.
- **`.htaccess` not honored.** GoDaddy's managed-WordPress configuration overrides certain `.htaccess` directives. If the rewrite isn't firing, check whether `AllowOverride` is set to a level that includes `FileInfo` and `Options` for your site root. Support can adjust this.
- **PHP version too old.** The `league/html-to-markdown` package requires PHP 8.0+. Older shared-hosting plans may default to PHP 7.4. Upgrade in the GoDaddy dashboard before testing.
## What about WordPress.com, Webflow, Big Cartel?
These platforms sit between the two cases above:
- **WordPress.com Free / Personal / Premium plans**: same closed-platform problem as Squarespace. Custom plugins and `.htaccess` aren't allowed. Partial workaround only.
- **WordPress.com Business or Pro plans**: plugin uploads are allowed, so the mu-plugin pattern above works. Treat this case the same as GoDaddy Managed WordPress.
- **Webflow**: closed platform, no HTTP-level access. Same constraint as Squarespace.
- **Big Cartel, Etsy storefronts, Substack**: closed platforms, no fix.
The pattern across all of these is consistent: if the platform exposes plugin uploads, custom code, or `.htaccess`, you can implement the fix. If it doesn't, you can advertise the alternate via `` and that's the ceiling.
## Related reading
- [The Original Markdown For Agents Warning Post](/blog/blog-fix-markdown-for-agents-warning/) — what the audit is checking and the Cloudflare-toggle path
- [Agent Runtime Readiness](/blog/blog-tool-agent-runtime-readiness/) — the audit tool itself
- [The Conversation Has Moved Past The Model](/blog/blog-agent-runtime-the-new-browser-layer/) — why this matters now
- [Netlify Edge Functions Pattern](/blog/blog-fix-markdown-for-agents-netlify/) — the migration target if you outgrow Squarespace
- [Origin Server Configs (Nginx / Apache / Caddy)](/blog/blog-fix-markdown-for-agents-origin-servers/) — the deeper origin-side guide
- [Build Your Web Stack Visualizer](/tools/build-your-web-stack-visualizer/) — decide which tier of host actually fits your needs
## Fact-check notes and sources
- Squarespace Code Injection documentation: [support.squarespace.com/hc/en-us/articles/205815928](https://support.squarespace.com/hc/en-us/articles/205815928)
- GoDaddy Managed WordPress `.htaccess` editing: [godaddy.com/help/edit-the-htaccess-file-on-my-managed-wordpress-account-9051](https://www.godaddy.com/help/edit-the-htaccess-file-on-my-managed-wordpress-account-9051)
- WordPress `template_redirect` action reference: [developer.wordpress.org/reference/hooks/template_redirect/](https://developer.wordpress.org/reference/hooks/template_redirect/)
- League HTML-to-Markdown PHP package: [github.com/thephpleague/html-to-markdown](https://github.com/thephpleague/html-to-markdown)
- HTTP `` for alternate-format discovery: [html.spec.whatwg.org/multipage/links.html#link-type-alternate](https://html.spec.whatwg.org/multipage/links.html#link-type-alternate)
- Vary header semantics: [RFC 9110 §12.5.5](https://www.rfc-editor.org/rfc/rfc9110#field.vary)
- Cloudflare Markdown for Agents reference: [developers.cloudflare.com/fundamentals/reference/markdown-for-agents/](https://developers.cloudflare.com/fundamentals/reference/markdown-for-agents/)
If you're at the point where the closed-builder ceiling is starting to bite — and you want a leaner, owned, build-your-own-web stack — *The $20 Dollar Agency* covers the migration and operating model end to end.
*This post is informational, not legal or SEO-consulting advice. Mentions of Squarespace, GoDaddy, WordPress, Cloudflare, and other third parties are nominative fair use; no affiliation is implied.*
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